How accurate is the US Navy formula?

The US Navy method is accurate within 3–4% for most people and correlates well with DEXA scan results. It can be less accurate for very lean or very obese individuals.

Why are hips measured for females only?

Women naturally store more fat in the hip area. Including hip measurement in the formula improves accuracy for female body composition estimation.

What are the body fat categories?

ACE categories for men: Essential Fat 2–5%, Athletic 6–13%, Fit 14–17%, Average 18–24%, Obese 25%+. For women: Essential 10–13%, Athletic 14–20%, Fit 21–24%, Average 25–31%, Obese 32%+.

Should I use cm or inches?

Either works — toggle between units and the formula recalculates automatically. Measure in the morning before eating for consistent results.

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Body Fat Calculator

Estimate your body fat percentage using the US Navy formula with a visual gauge and category.

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このツールについて

Calculate your body fat percentage using the U.S. Navy circumference method, one of the most accurate non-invasive measurement techniques. Enter your gender, height, neck, and waist measurements (plus hips for females) in either centimeters or inches. The tool calculates your body fat percentage and places you in a category: Essential, Athletic, Fit, Average, or Obese — based on ACE (American Council on Exercise) standards. A color-coded SVG gauge visually shows your result within the classification scale.

使い方

1 Select your gender (male or female).
2 Choose your preferred measurement unit (cm or inches).
3 Enter your height, neck circumference, and waist circumference.
4 Females: also enter your hip circumference.
5 Click Calculate to see your body fat percentage, category, and gauge.

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